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      11-16-2018, 02:53 PM   #5
dradernh
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Drives: 2017 M240i
Join Date: Aug 2013
Location: SW Ohio

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Quote:
Originally Posted by XutvJet View Post
For those that track their cars, especially ones on the OEM suspension, in your opinion, which axle needs the most help with respect to control? After owning the car for 2.5 years, it seems to be like the rear axle needs a bit more control, perhaps damping. The front end feels pretty good with the exception of the narrow 225 width tires.

By the way, I'm not concerned about the sway bars.
Because I knew before I bought it that I'd be tracking my car, I went straight to the LSD, suspension, and everything else in my signature right after breaking the motor in. As a result, I can't answer your questions directly.

For sure your front-end won't feel pretty good on the track without some decent negative camber and some wider and track-capable rubber to go with it. Because I didn't want to realign the car before and after each event, I went with -1.9° up front. Partly that had to do with fitting a 255 into the fender opening, and the other consideration was getting a decent amount of non-track miles out of the MPSS'. The builder told me to expect 8K with that amount of negative camber.

I didn't care for how the front behaved on the track last season. It was predictable, but not particularly sharp. At 3800# two-up, however, turn-in-right-now sharpness is always going to be lacking. Nevertheless, I'm considering the H&R front bar, which the builder told me would be the next step if I wanted improved turn-in capabilities. The downside to that is increased NVH - how much of that is a matter of installing the bar to find out. I'm also considering more negative camber, and a step up in tire compound (likely Hoosier R7s in 265 R / 245 F). At the same time, I'm making sure I don't turn this from a street/track car into a track/street car - been there, done that, done with that.

Something else to consider: the brakes. Mine aren't up to what I'm doing with the car now, and I'm not leaning on it very hard at all. Unless I can have a brake duct kit built to feed air into the interior of the rotors, I don't see how this is going to be solved without going to a big-brake kit; even then, you still have to cool them or after enough laps the heat eventually makes its way into the fluid.

Sorry...kind of went OT there.

Quote:
Originally Posted by Dylan86 View Post
Front axle NEEDS more camber, for track use, as you will be frustrated with the understeer and tire wear without it. Rear camber is adjustable so it's a "non issue". Aside from that and an LSD out back already installed, you should be fine. The obvious damping issues can only be resolved by being replaced, unfortunately...
+1 All of it.
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2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro;
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